[FFmpeg-user] Replacing Specific Frames with Specific Other Frames

[Sam Logan]

On 5/15/14, Oliver Fromme <oliver at fromme.com> wrote:
> 4. Encode the rest of the source video starting at frame 99
>    into another separate video file (again, without audio).
>    This can be done with the -ss option.

I thought the -ss option only accepts timestamps. So how do I encode
starting at exactly frame 99 with -ss?